Results for "Valeria de Paiva"

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Proposal of Pattern Recognition as a necessary and sufficient Principle to Cognitive ScienceMay 31 2011Despite the prevalence of the Computational Theory of Mind and the Connectionist Model, the establishing of the key principles of the Cognitive Science are still controversy and inconclusive. This paper proposes the concept of Pattern Recognition as Necessary ... More
Pattern Recognition Theory of MindJul 26 2009I propose that pattern recognition, memorization and processing are key concepts that can be a principle set for the theoretical modeling of the mind function. Most of the questions about the mind functioning can be answered by a descriptive modeling ... More
Fuzzy Topological SystemsJul 13 2011Dialectica categories are a very versatile categorical model of linear logic. These have been used to model many seemingly different things (e.g., Petri nets and Lambek's calculus). In this note, we expand our previous work on fuzzy petri nets to deal ... More
Dialectica Categories for the Lambek CalculusJan 21 2018We revisit the old work of de Paiva on the models of the Lambek Calculus in dialectica models making sure that the syntactic details that were sketchy on the first version got completed and verified. We extend the Lambek Calculus with a \kappa modality, ... More
Proceedings of the LexSem+Logics Workshop 2016Aug 14 2016Lexical semantics continues to play an important role in driving research directions in NLP, with the recognition and understanding of context becoming increasingly important in delivering successful outcomes in NLP tasks. Besides traditional processing ... More
Linguistic Legal Concept Extraction in PortugueseOct 22 2018This work investigates legal concepts and their expression in Portuguese, concentrating on the "Order of Attorneys of Brazil" Bar exam. Using a corpus formed by a collection of multiple-choice questions, three norms related to the Ethics part of the OAB ... More
On the Lambek Calculus with an Exchange ModalityApr 15 2019In this paper we introduce Commutative/Non-Commutative Logic (CNC logic) and two categorical models for CNC logic. This work abstracts Benton's Linear/Non-Linear Logic by removing the existence of the exchange structural rule. One should view this logic ... More
The ILLTP Library for Intuitionistic Linear LogicApr 15 2019Benchmarking automated theorem proving (ATP) systems using standardized problem sets is a well-established method for measuring their performance. However, the availability of such libraries for non-classical logics is very limited. In this work we propose ... More
Proceedings Joint International Workshop on Linearity & Trends in Linear Logic and ApplicationsApr 12 2019This volume contains a selection of papers presented at Linearity/TLLA 2018: Joint Linearity and TLLA workshops (part of FLOC 2018) held on July 7-8, 2018 in Oxford. Linearity has been a key feature in several lines of research in both theoretical and ... More
Surface Thermal Gradients Activated by Enhanced Molecular Absorption in Mid-infrared Vertical Antenna ArraysDec 19 2018We investigate local heat generation by molecules at the apex of polymer-embedded vertical antennas excited at resonant mid-infrared wavelengths, exploiting the surface enhanced infrared absorption (SEIRA) effect. The embedding of vertical nanoantennas ... More
Dual spheres have the same girthAug 30 2004Symplectic and Finsler geometry are used to settle a conjecture of Sch\"affer stating that the girth of a normed space--the infimum of the lengths of all closed, rectifiable, centrally symmetric curves on its unit sphere--equals the girth of its dual. ... More
Forecasting intracranial hypertension using multi-scale waveform metricsFeb 25 2019Objective: Intracranial hypertension is an important risk factor of secondary brain damage after traumatic brain injury. Hypertensive episodes are often diagnosed reactively and time is lost before counteractive measures are taken. A pro-active approach ... More
Simplicial and modular aspects of string dualitiesMay 04 2006This Ph.D. thesis collects results obtained investigating two different aspects of modern unifying theories. In the first part I summarized results achieved investigating simplicial aspects of string dualities. Exploiting Boundary Conformal Field Theory ... More
Statistical analysis of probability density functions for photometric redshifts through the KiDS-ESO-DR3 galaxiesOct 23 2018Despite the high accuracy of photometric redshifts (zphot) derived using Machine Learning (ML) methods, the quantification of errors through reliable and accurate Probability Density Functions (PDFs) is still an open problem. First, because it is difficult ... More
Quasinormal modes of Regular Black Hole ChargeOct 21 2018The quasinormal modes (QNMs) of a regular black hole with charge are calculated in the eikonal approximation. In the eikonal limit the QNMs of black hole are determined by the parameters of the unstable circular null geodesics. The behaviors of QNMs are ... More
Operator mixing and three-point functions in N=4 SYMJul 09 2009We study the three-point functions between two BPS and one non-BPS local gauge invariant operators in N=4 Super Yang-Mills theory. In particular we show, in explicit 1-loop examples, that the operator mixing discussed in arXiv:0810.0499 plays an important ... More
From random Regge triangulations to open stringsFeb 14 2007We show how Boundary Conformal Field Theory deformation techniques allow for a complete characterisation of the coupling between the discrete geometry inherited uniformizing a random Regge triangulations and open string theory.
Quantitative orbital angular momentum measurement of perfect vortex beamsFeb 12 2019Perfect (optical) vortices (PVs) have the mooted ability to encode orbital angular momentum (OAM) onto the field within a well-defined annular ring. Although this makes the near-field radial profile independent of OAM, the far-field radial profile nevertheless ... More
Large deviations for risk measures in finite mixture modelsOct 09 2017Feb 09 2018Due to their heterogeneity, insurance risks can be properly described as a mixture of different fixed models, where the weights assigned to each model may be estimated empirically from a sample of available data. If a risk measure is evaluated on the ... More
Tidal Love numbers of a slowly spinning neutron starSep 07 2015Dec 02 2015By extending our recent framework to describe the tidal deformations of a spinning compact object, we compute for the first time the tidal Love numbers of a spinning neutron star to linear order in the angular momentum. The spin of the object introduces ... More
Large deviations for method-of-quantiles estimators of one-dimensional parametersNov 15 2016Nov 19 2018We consider method-of-quantiles estimators of unknown parameters, namely the analogue of method-of-moments estimators obtained by matching empirical and theoretical quantiles at some probability level lambda in (0,1). The aim is to present large deviation ... More
Geodesic Motion in the Singly Spinning Black Ring SpacetimeAug 13 2012Dec 04 2012We present analytical solutions of the geodesic equations of test particles and light in the five dimensional singly spinning black ring spacetime for special cases, since it does not appear possible to separate the Hamilton-Jacobi-equation for singly ... More
Measuring Coherence of Quantum MeasurementsMar 04 2019The superposition of quantum states lies at the heart of physics and has been recently found to serve as a versatile resource for quantum information protocols, defining the notion of quantum coherence. In this contribution, we report on the implementation ... More
Dynamic capillary assembly of colloids at interfaces with 10,000g accelerationsFeb 26 2018Extreme deformation of soft matter is central to our understanding of the effects of shock, fracture, and phase change in a variety of systems. Yet, despite, the increasing interest in this area, far-from-equilibrium behaviours of soft matter remain challenging ... More
Fast approaches for Bayesian estimation of size of hard-to-reach populations using Network Scale-upApr 12 2018The Network scale-up method is commonly used to overcome difficulties in estimating the size of hard-to-reach populations. The method uses indirect information based on social network of each participant taken from the general population, but in some ... More
A Novel Geometric Framework on Gram Matrix Trajectories for Human Behavior UnderstandingJun 29 2018In this paper, we propose a novel space-time geometric representation of human landmark configurations and derive tools for comparison and classification. We model the temporal evolution of landmarks as parametrized trajectories on the Riemannian manifold ... More
The HPS electromagnetic calorimeterOct 14 2016The Heavy Photon Search experiment (HPS) is searching for a new gauge boson, the so-called "heavy photon". Through its kinetic mixing with the Standard Model photon, this particle could decay into an electron-positron pair. It would then be detectable ... More
Intra-cluster Globular Clusters in a Simulated Galaxy ClusterDec 14 2017Using a cosmological dark matter simulation of a galaxy-cluster halo, we follow the temporal evolution of its globular cluster population. To mimic the red and blue globular cluster populations, we select at high redshift $(z\sim 1)$ two sets of particles ... More
Testing Gravity with Quasi Periodic Oscillations from accreting Black Holes: the Case of Einstein-Dilaton-Gauss-Bonnet TheoryDec 10 2014Feb 10 2015Quasi-Periodic Oscillations (QPOs) observed in the X-ray flux emitted by accreting black holes, are associated to phenomena occurring near the horizon. Future very large area X-ray instruments will be able to measure QPO frequencies with very high precision, ... More
A Derivation of the Vlasov-Navier-Stokes Model for Aerosol Flows from Kinetic TheoryAug 01 2016This article proposes a derivation of the Vlasov-Navier-Stokes system for spray/aerosol flows. The distribution function of the dispersed phase is governed by a Vlasov-equation, while the velocity field of the propellant satisfies the Navier-Stokes equations ... More
Non-minimally coupled dark matter: effective pressure and structure formationMar 26 2012Jul 13 2012We propose a phenomenological model in which a non-minimal coupling between gravity and dark matter is present in order to address some of the apparent small scales issues of \lcdm model. When described in a frame in which gravity dynamics is given by ... More
A Learning Theory Approach to a Computationally Efficient Parameter Selection for the Elastic NetSep 23 2018Despite recent advances in regularisation theory, the issue of parameter selection still remains a challenge for most applications. In a recent work the framework of statistical learning was used to approximate the optimal Tikhonov regularisation parameter ... More
Prime Focus Spectrograph - Subaru's future -Oct 09 2012The Prime Focus Spectrograph (PFS) of the Subaru Measurement of Images and Redshifts (SuMIRe) project has been endorsed by Japanese community as one of the main future instruments of the Subaru 8.2-meter telescope at Mauna Kea, Hawaii. This optical/near-infrared ... More
Generalized Nehari manifold and semilinear Schrödinger equation with weak monotonicity condition on the nonlinear termSep 15 2016We study the Schr\"odinger equations $-\Delta u + V(x)u = f(x,u)$ in $\mathbb{R}^N$ and $-\Delta u - \lambda u = f(x,u)$ in a bounded domain $\Omega\subset\mathbb{R}^N$. We assume that $f$ is superlinear but of subcritical growth and $u\mapsto f(x,u)/|u|$ ... More
A WKB-like approach to Unruh RadiationJan 27 2010Unruh radiation is the thermal flux seen by an accelerated observer moving through Minkowski spacetime. In this article we study Unruh radiation as tunneling through a barrier. We use a WKB-like method to obtain the tunneling rate and the temperature ... More
Temporal contribution to gravitational WKB-like calculationsApr 15 2008Aug 06 2008Recently, it has been shown that the radiation arising from quantum fields placed in a gravitational background (e.g. Hawking radiation) can be derived using a quasi-classical calculation. Here we show that this method has a previously overlooked temporal ... More
The Atacama Large Millimeter/submillimeter Array (ALMA) Band-1 ReceiverDec 02 2016The Atacama Large Millimeter/submillimeter Array(ALMA) Band 1 receiver covers the 35-50 GHz frequency band. Development of prototype receivers, including the key components and subsystems has been completed and two sets of prototype receivers were fully ... More
Existence and multiplicity results for a class of non-linear Schrödinger equations with magnetic potential involving sign-changing non linearityApr 12 2019In this work we consider the following class of elliptic problems $$- \Delta_A u + u = a(x) |u|^{q-2}u+b(x) |u|^{p-2}u , \mbox{ in } \mathbb{R}^N, $$ $u\in H^1_A (\mathbb{R}^N)$, with $2<q<p<2^*= \frac{2N}{N-2}$, $a(x)$ and $b(x)$ are functions that can ... More
Existence at least four solutions for a Schrödinger equation with magnetic potential involving sign-changing weight functionApr 12 2019In this paper we consider the following class of elliptic problems $$- \Delta_A u + u = a_{\lambda}(x) |u|^{q-2}u+b_{\mu}(x) |u|^{p-2}u ,$$ for $x \in \mathbb{R}^N$, $1<q<2<p<2^*-1= \frac{N+2}{N-2}$, $a_{\lambda}(x)$ is a sign-changing weight function, ... More
Comments on anomaly versus WKB/tunneling methods for calculating Unruh radiationAug 25 2008Feb 21 2009In this Letter we make a critique of, and comparison between, the anomaly method and WKB/tunneling method for obtaining radiation from non-trivial spacetime backgrounds. We focus on Rindler spacetime (the spacetime of an accelerating observer) and the ... More
Hyperelliptic integrals and Hořava-Lifshitz black hole space-timesJun 13 2011Dec 21 2011The description of many dynamical problems like the particle motion in higher dimensional spherically and axially symmetric space-times is reduced to the inversion of hyperelliptic integrals of all three kinds. The result of the inversion is defined locally, ... More
Particle motion in Horava-Lifshitz black hole space-timesJun 24 2011Aug 30 2011We study the particle motion in the space-time of a Kehagias-Sfetsos (KS) black hole. This is a static spherically symmetric solution of a Horava-Lifshitz gravity model that reduces to General Relativity in the IR limit and deviates slightly from detailed ... More
Field-induced Ordering in Critical AntiferromagnetsDec 21 1998Transfer-matrix scaling methods have been used to study critical properties of field-induced phase transitions of two distinct two-dimensional antiferromagnets with discrete-symmetry order parameters: triangular-lattice Ising systems (TIAF) and the square-lattice ... More
Existence, multiplicity and regularity for a Schrödinger equation with magnetic potential involving sign-changing weight functionApr 15 2019In this paper we consider the following class of elliptic problems $$- \Delta_A u + u = a_{\lambda}(x) |u|^{q-2}u+b_{\mu}(x) |u|^{p-2}u ,\,\, x\in \mathbb{R}^N$$ where $1<q<2<p<2^*-1= \frac{N+2}{N-2}$, $a_{\lambda}(x)$ is a sign-changing weight function, ... More
Constraining Black Holes with Light Boson Hair and Boson Stars using Epicyclic Frequencies and QPOsNov 30 2016Jun 17 2017Light bosonic fields are ubiquitous in extensions of the Standard Model. Even when minimally coupled to gravity, these fields might evade the assumptions of the black-hole no-hair theorems and give rise to spinning black holes which can be drastically ... More
Stability analysis of a model gene network links aging, stress resistance, and negligible senescenceAug 03 2014Several animal species are considered to exhibit what is called negligible senescence, i.e. they do not show signs of functional decline or any increase of mortality with age, and do not have measurable reductions in reproductive capacity with age. Recent ... More
Learning multimodal representations for sample-efficient recognition of human actionsMar 06 2019Humans interact in rich and diverse ways with the environment. However, the representation of such behavior by artificial agents is often limited. In this work we present \textit{motion concepts}, a novel multimodal representation of human actions in ... More
Hydrodynamic mobility of confined polymeric particles, vesicles and cancer cells in a square microchannelNov 06 2017Nov 27 2017The transport of deformable objects including polymer particles, vesicles and cells, has been a subject of interest for several decades where the majority of experimental and theoretical studies have been focused on circular tubes. Due to advances in ... More
Rigidity index preservation of regular holonomic D-modulesMay 04 2012This paper shows algebraically that the Fourier transform preserves the rigidity index of irreducible regular holonomic $\mathcal{D}_{\mathbb{P}^1}[*\{\infty\}]$-modules.
ALPRS - A New Approach for License Plate Recognition using the Sift AlgorithmMar 07 2013This paper presents a new approach for the automatic license plate recognition, which includes the SIFT algorithm in step to locate the plate in the input image. In this new approach, besides the comparison of the features obtained with the SIFT algorithm, ... More
Distinguishing standard and modified gravity cosmologies with machine learningOct 25 2018We present a convolutional neural network to identify distinct cosmological scenarios based on the weak-lensing maps they produce. Modified gravity models with massive neutrinos can mimic the standard concordance model in terms of Gaussian weak-lensing ... More
Efficient Differential Fourier-Transform Spectrometer for precision Sunyaev-Zel'dovich effect measurementsFeb 17 2014May 26 2014Precision measurements of the Sunyaev-Zel'dovich effect in clusters of galaxies require excellent rejection of common-mode signals and wide frequency coverage. We describe an imaging, efficient, differential Fourier transform spectrometer (FTS), optimized ... More
Photoassociative ionization of Na inside a storage ringJul 31 2009Dec 25 2011Motivated by recent interest in low dimensional arrays of atoms, we experimentally investigated the way cold collisional processes are affected by the geometry of the considered atomic sample. More specifically, we studied the case of photoassociative ... More
Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrographJul 02 2015The Prime Focus Spectrograph (PFS) is an optical/near-infrared multifiber spectrograph with 2394 science fibers distributed across a 1.3-deg diameter field of view at the Subaru 8.2-m telescope. The wide wavelength coverage from 0.38 {\mu}m to 1.26 {\mu}m, ... More
The Lyapunov matrix equation. Matrix analysis from a computational perspectiveJan 29 2015Decay properties of the solution $X$ to the Lyapunov matrix equation $AX + X A^T = D$ are investigated. Their exploitation in the understanding of equation matrix properties, and in the development of new numerical solution strategies when $D$ is not ... More
A mathematical model for the primary tumor of mCRC and analysis of clinical data based on 5-FU and bevacizumab regimenJul 27 2016The growth of the primary tumor of metastatic colorectal cancer (mCRC) and associated angiogenesis is modeled by a system of ordinary differential equations for basic quantities which summarize the number of proliferating and hypoxic cancer cells, the ... More
Cosmic Star Formation: a simple model of the SFRD(z)Nov 09 2017We investigate the evolution of the cosmic star formation rate density (SFRD) from redshift z=20 to z=0 and compare it with the observational one by Madau and Dickinson derived from recent compilations of UV and IR data. The theoretical SFRD(z) and its ... More
Testing modified gravity with Planck: the case of coupled dark energyMay 31 2013The Planck collaboration has recently published maps of the Cosmic Microwave Background (CMB) radiation, in good agreement with a LCDM model, a fit especially valid for multipoles l > 40. We explore here the possibility that dark energy is dynamical and ... More
The nonlinear Schrödinger equation on the hyperbolic spaceJun 03 2004Nov 29 2007In this article we study some aspects of dispersive and concentration phenomena for the Schr\"odinger equation posed on hyperbolic space $\mathbb{H}^n$, in order to see if the negative curvature of the manifold gets the dynamics more stable than in the ... More
Different approaches to the study of the gravitational radiation emitted by astrophysical sourcesDec 17 1999Dec 20 1999Stars and black holes are sources of gravitational radiation in many phases of their life, and the signals they emit exhibit features that are characteristic of the generating process. Emitted since the beginning of star formation, these signals also ... More
Cell membrane disruption by vertical nanopillars: the role of membrane bending and traction forcesApr 27 2018Gaining access to the cell interior is fundamental for many applications, such as electrical recording, drug and biomolecular delivery. A very promising technique consists of culturing cells on nano/micro pillars. The tight adhesion and high local deformation ... More
Quantitative MRI molecular imaging in the evaluation of early post mortem changes in muscles. A feasibility study on a pig phantomMar 06 2019Estimating early postmortem interval EPI is a difficult task in daily forensic activity due to limitations of accurate and reliable methods. The aim of the present work is to describe a novel approach in the estimation of EPI based on quantitative magnetic ... More
Dual mixed volumes and isosystolic inequalitiesAug 30 2004The theory of dual mixed volumes is extended to star bodies in cotangent bundles and is used to prove several isosystolic inequalities for Hamiltonian systems and Finsler metrics.
Gravitational waves from perturbed starsMay 09 2011Non radial oscillations of neutron stars are associated with the emission of gravitational waves. The characteristic frequencies of these oscillations can be computed using the theory of stellar perturbations, and they are shown to carry detailed information ... More
Is there any measurable benefit in publishing preprints in the arXiv section Quantitative Biology?Nov 07 2014A public preprint server such as arXiv allows authors to publish their manuscripts before submitting them to journals for peer review. It offers the chance to establish priority by making the results available upon completion. This article presents the ... More
The potential of preprints to accelerate scholarly communication - A bibliometric analysis based on selected journalsJun 20 2013This paper quantifies to which extent preprints in arXiv accelerate scholarly communication. The following subject fields were investigated up to the year 2012: High Energy Physics (HEP), Mathematics, Astrophysics, Quantitative Biology, and Library and ... More
The Underlying Event in Hadron-Hadron CollisionsMay 10 2002We measured the ambient energy in jet events using data of the CDF experiment at center-of-mass energies of 1800 and 630 GeV by examining the transverse momentum of charged particles in a region of the detector far away from the two most energetic jets ... More
The underlying event in jet and minimum bias events at the TevatronNov 29 2001We describe a study of the underlying event in jet and minimum bias events using data from the CDF detector. The underlying event contribution to the jet energy has been calculated in jet events and compared to the results of two Monte Carlo programs: ... More
Thermoplasmonic Effect of Surface Enhanced Infrared Absorption in Vertical Nanoantenna ArraysJan 23 2018The temperature increase and temperature gradients induced by mid-infrared laser illumination of vertical gold nanoantenna arrays embedded into polymer layers was measured directly with a photothermal expansion nanoscope. Nanoscale thermal hotspot images ... More
Correlation driven Mott-insulator-to-metal transitionMar 29 2013We study transport properties of the half-filled two-dimensional (2D) Hubbard model with spatially varying interactions, where a pattern of interacting and non-interacting sites is formed. We use Determinantal Quantum Monte Carlo method to calculate the ... More
Deformations of Hyperbolic Cone-Structures: Study of the Collapsing caseJan 13 2012This work is devoted to the study of deformations of hyperbolic cone structures under the assumption that the lengths of the singularity remain uniformly bounded over the deformation. Given a sequence $(M_{i}%, p_{i}) $ of pointed hyperbolic cone-manifolds ... More
Can AMS-02 discriminate the origin of an anti-proton signal?Jun 20 2014Nov 09 2014Indirect searches can be used to test dark matter models against expected signals in various channels, in particular antiprotons. With antiproton data available soon at higher and higher energies, it is important to test the dark matter hypothesis against ... More
Hydrodynamical simulations of galaxy clusters in dark energy cosmologies: I. general propertiesAug 31 2010Mar 23 2012We investigate the influence of dark energy on structure formation, within five different cosmological models, namely a concordance $\Lambda$CDM model, two models with dynamical dark energy, viewed as a quintessence scalar field (using a RP and a SUGRA ... More
Hand range of motion evaluation for Rheumatoid Arthritis patientsMar 16 2019We introduce a framework for dynamic evaluation of the fingers movements: flexion, extension, abduction and adduction. This framework estimates angle measurements from joints computed by a hand pose estimation algorithm using a depth sensor (Realsense ... More
Evolution by the vortex filament equation of curves with a cornerAug 20 2013In this proceedings article we shall survey a series of results on the stability of self-similar solutions of the vortex filament equation. This equation is a geometric flow for curves in $\mathbb R^3$ and it is used as a model for the evolution of a ... More
What gravitational signals say about the structure and the evolution of astrophysical sourcesJan 16 2002Gravitational waves transport very detailed information on the structure and evolution of astrophysical sources. For instance a binary system in the early stages of its evolution emits a wavetrain at specific frequencies that depend on the characteristics ... More
Less is more: How cosmic voids can shed light on dark energyNov 14 2012We showed how the shape of cosmic voids can be used to distinguish between different models of dark energy using galaxy positions.
The darkness that shaped the void: dark energy and cosmic voidsMay 18 2012Jun 12 2012Aims: We assess the sensitivity of void shapes to the nature of dark energy that was pointed out in recent studies. We investigate whether or not void shapes are useable as an observational probe in galaxy redshift surveys. We focus on the evolution of ... More
A mathematical model for growth of solid tumors and combination therapy with an application to colorectal cancerJul 27 2016May 30 2017We present a mathematical model, based on ordinary differential equations, for the evolution of solid tumors and their response to treatment. Specifically the effects of a cytotoxic agent and a monoclonal antibody are included as control term in the equations. ... More
Oscillations of small bubbles and medium yielding in elastoviscoplastic fluidsApr 02 2019We investigate the radial oscillations of small gas bubbles trapped in yield-stress fluid and driven by an acoustic pressure field. We model the rheological behavior of the yield-stress fluid using the recently developed elasto-visco-plastic (EVP) constitutive ... More
Remarks on the blow-up for the Schrödinger equation with critical mass on a plane domainJan 13 2004In this paper we concentrate on the analysis of the critical mass blowing-up solutions for the cubic focusing Schr\"odinger equation with Dirichlet boundary conditions, posed on a plane domain. We bound the blow-up rate from below, for bounded and unbounded ... More
Stop or Continue Data Collection: A Nonignorable Missing Data Approach for Continuous VariablesNov 06 2015We present an approach to inform decisions about nonresponse followup sampling. The basic idea is (i) to create completed samples by imputing nonrespondents' data under various assumptions about the nonresponse mechanisms, (ii) take hypothetical samples ... More
Deformation of Hyperbolic Cone-Structures: Study of the non-Colapsing caseMar 07 2012This work is devoted to the study of deformations of hyperbolic cone structures under the assumption that the lengths of the singularity remain uniformly bounded over the deformation. Given a sequence (M_{i},p_{i}) of pointed hyperbolic cone-manifolds ... More
Asymmetry in Hilbert's fourth problemJan 11 2013In the asymmetric setting, Hilbert's fourth problem asks to construct and study all (non-reversible) projective Finsler metrics: Finsler metrics defined on open, convex subsets of real projective $n$-space for which geodesics lie on projective lines. ... More
Weak lensing analysis of galaxy pairs using CS82 dataNov 12 2018In this work we analyze a sample of close galaxy pairs (relative projected separation $<25 h^{-1}$kpc and relative radial velocities $< 350$ km s$^{-1}$) using a weak lensing analysis based on the CFHT Stripe 82 Survey. We determine halo masses for the ... More
Accurate Segmentation of Dermoscopic Images based on Local Binary Pattern ClusteringFeb 17 2019Feb 20 2019Segmentation is a key stage in dermoscopic image processing, where the accuracy of the border line that defines skin lesions is of utmost importance for subsequent algorithms (e.g., classification) and computer-aided early diagnosis of serious medical ... More
Generalized detailed balance relation for black hole horizon's fluctuationsDec 06 2017In classical thermodynamics, irreversible processes are accomplished with an increase of entropy and a release of heat into the environment. In the case of black hole thermodynamics, instead, the increase of entropy is related with the absorption of energy ... More
On the Geometry of Planar Domain WallsMay 11 1995The Geometry of planar domain walls is studied. It is argued that the planar walls indeed have plane symmetry. In the Minkowski coordinates the walls are mapped into revolution paraboloids.
Accurate Segmentation of Dermoscopic Images based on Local Binary Pattern ClusteringFeb 17 2019Segmentation is a key stage in dermoscopic image processing, where the accuracy of the border line that defines skin lesions is of utmost importance for subsequent algorithms (e.g., classification) and computer-aided early diagnosis of serious medical ... More
Leveraging Large Amounts of Weakly Supervised Data for Multi-Language Sentiment ClassificationMar 07 2017This paper presents a novel approach for multi-lingual sentiment classification in short texts. This is a challenging task as the amount of training data in languages other than English is very limited. Previously proposed multi-lingual approaches typically ... More
Accurate Segmentation of Dermoscopic Images based on Local Binary Pattern ClusteringFeb 17 2019Feb 19 2019Segmentation is a key stage in dermoscopic image processing, where the accuracy of the border line that defines skin lesions is of utmost importance for subsequent algorithms (e.g., classification) and computer-aided early diagnosis of serious medical ... More
Controlled Intracellular Delivery of Single Particles in Single Cells by 3D Hollow NanoelectrodesJul 20 2018We present an electrophoretic platform based on 3D hollow nanoelectrodes capable of controlling and quantifying the intracellular delivery of single nanoparticles in single selected cells by surface-enhanced Raman spectroscopy (SERS). The gold-coated ... More
Christhin: Quantitative Analysis of Thin Layer ChromatographyApr 23 2012May 04 2012Manual for Christhin 0.1.36 Christhin (Chromatography Riser Thin) is software developed for the quantitative analysis of data obtained from thin-layer chromatographic techniques (TLC). Once installed on your computer, the program is very easy to use, ... More
Polish device for FOCCoS/PFS slit systemAug 12 2014The Fiber Optical Cable and Connector System, FOCCoS, for the Prime Focus Spectrograph, PFS, is responsible for transporting light from the Subaru Telescope focal plane to a set of four spectrographs. Each spectrograph will be fed by a convex curved slit ... More
On the limits of Brans-Dicke spacetimes: a coordinate-free approachApr 20 1993We investigate the limit of Brans-Dicke spacetimes as the scalar field coupling constant omega tends to infinity applying a coordinate-free technique. We obtain the limits of some known exact solutions. It is shown that these limits may not correspond ... More
Stability of the selfsimilar dynamics of a vortex filamentFeb 06 2012Apr 03 2013In this paper we continue our investigation about selfsimilar solutions of the vortex filament equation, also known as the binormal flow (BF) or the localized induction equation (LIE). Our main result is the stability of the selfsimilar dynamics of small ... More
On the existence and approximation of a dissipating feedbackOct 31 2018Nov 03 2018Given a matrix $A\in \R^{n\times n}$ and a tall rectangular matrix $B \in \R^{n\times q}$, $q < n$, we consider the problem of making the pair $(A,B)$ dissipative, that is the determination of a {\it feedback} matrix $K \in \R^{q\times n}$ such that the ... More
Order reduction approaches for the algebraic Riccati equation and the LQR problemNov 03 2017We explore order reduction techniques for solving the algebraic Riccati equation (ARE), and investigating the numerical solution of the linear-quadratic regulator problem (LQR). A classical approach is to build a surrogate low dimensional model of the ... More
On the stability of a singular vortex dynamicsFeb 14 2008Aug 27 2008In this paper we address the question of the singular vortex dynamics exhibited in [15], which generates a corner in finite time. The purpose is to prove that under some appropriate small regular perturbation the corner still remains. Our approach uses ... More
From Community Detection to Community DeceptionSep 01 2016The community deception problem is about how to hide a target community C from community detection algorithms. The need for deception emerges whenever a group of entities (e.g., activists, police enforcements) want to cooperate while concealing their ... More